191492991307 has 2 divisors, whose sum is σ = 191492991308. Its totient is φ = 191492991306.

The previous prime is 191492991281. The next prime is 191492991323. The reversal of 191492991307 is 703199294191.

It is a strong prime.

It is an emirp because it is prime and its reverse (703199294191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191492991307 - 2¹⁵ = 191492958539 is a prime.

It is not a weakly prime, because it can be changed into another prime (191492991397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95746495653 + 95746495654.

It is an arithmetic number, because the mean of its divisors is an integer number (95746495654).

Almost surely, 2^191492991307 is an apocalyptic number.

191492991307 is a deficient number, since it is larger than the sum of its proper divisors (1).

191492991307 is an equidigital number, since it uses as much as digits as its factorization.

191492991307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 191492991307 in words is "one hundred ninety-one billion, four hundred ninety-two million, nine hundred ninety-one thousand, three hundred seven".